I lived in Australia for about 5 years (from the US) and definitely felt the shock both ways. Which is kind of crazy because the countries are waaaay more similar than the US & Japan. My husband (Australian) struggles with it too. More in the sense that the US doesn’t feel like home to him, so he longs for Australia. But then after short trips home to Aus he declares he could never live there again. Moving across the world is a funny thing. But I think it is good for a person to get that experience, even if only for a few years.